Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet dung le snippets" » "viet hung le snippets", "viet huong le snippets", "viet trung le snippets", "viet dung len snippets", "viet dung he snippets", "viet dung de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("viet dung le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet dung le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet dung le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet dung le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.